Ok so for transparency, this is not my car, im a tech and was given this basket case of a car. A previous tech has done a bunch of work on it and I dont know everything, or if the car originally came in with this issue, or if it presented itself later.
But the meat of it is that the car will cut its ignition during acceleration for a split second. Seems to mainly do it when cold, and gradually get better as you drive the car. Issue happens most commonly between 1k-3k rpm, so just normal acceleration from stops. Its so bad that it will just faceplant on itself when it happens, then go on like normal.
Sometimes, the car will throw faults for fuel pump, and for space relay. But that doesnt happen often. No lights illuminate when this happens. At one point I had the launch scan tool hooked up to the car, watching actual values and when it happened the scanner lost communication with the DME.
There have been numerous things replaced since the issue presented itself, some for this issue, some for general maintenance. For brevity ill just make a list of parts, and skip the story.
-ekp relay
-DME relay
-fuel pump
-DME/EKP relay holder and harness
-crank sensor
-coolant temp sensor
-throttle position sensor
-idle air control valve
-fuel pump connector pins and further wiring repairs for the pump
-battery
-distributor cap, rotor, wires, plugs, etc.
-ignition switch with attached harness
-DME swapped with a used unit
-MAF unit swapped with used unit
I know its really a bad look to just be slinging parts and asking forums but between whats been done already and the couple things ive done, all the bases are covered. My brain does keep coming back to the mass air flow meter, it is possible the "new" one is bad as well, but in the exact same way seems unlikely. Im just at a bit of a loss here, and im more of a mercedes and porsche guy, im very far from familiar with e30s. In fact this is the very first one ive worked on.
And input would be appreciated, this is the second inherited headache ive gotten from my job and eliminating one would be wonderful.
But the meat of it is that the car will cut its ignition during acceleration for a split second. Seems to mainly do it when cold, and gradually get better as you drive the car. Issue happens most commonly between 1k-3k rpm, so just normal acceleration from stops. Its so bad that it will just faceplant on itself when it happens, then go on like normal.
Sometimes, the car will throw faults for fuel pump, and for space relay. But that doesnt happen often. No lights illuminate when this happens. At one point I had the launch scan tool hooked up to the car, watching actual values and when it happened the scanner lost communication with the DME.
There have been numerous things replaced since the issue presented itself, some for this issue, some for general maintenance. For brevity ill just make a list of parts, and skip the story.
-ekp relay
-DME relay
-fuel pump
-DME/EKP relay holder and harness
-crank sensor
-coolant temp sensor
-throttle position sensor
-idle air control valve
-fuel pump connector pins and further wiring repairs for the pump
-battery
-distributor cap, rotor, wires, plugs, etc.
-ignition switch with attached harness
-DME swapped with a used unit
-MAF unit swapped with used unit
I know its really a bad look to just be slinging parts and asking forums but between whats been done already and the couple things ive done, all the bases are covered. My brain does keep coming back to the mass air flow meter, it is possible the "new" one is bad as well, but in the exact same way seems unlikely. Im just at a bit of a loss here, and im more of a mercedes and porsche guy, im very far from familiar with e30s. In fact this is the very first one ive worked on.
And input would be appreciated, this is the second inherited headache ive gotten from my job and eliminating one would be wonderful.
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